Nissan Frontier. Manual - part 893

HAC-126

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

INTAKE SENSOR

1. Turn ignition switch OFF.

2. Disconnect front air control connector.

3. Check continuity between intake sensor harness connector

M146 (B) terminal 1 and front air control harness connector M50

(A) terminal 26.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK INTAKE SENSOR

Refer to 

HAC-126, "Intake Sensor Component Inspection"

.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Replace intake sensor. Refer to 

VTL-10, "Removal and Installation"

.

4.

CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL

1. Turn ignition switch OFF.

2. Disconnect front air control connector.

3. Check continuity between intake sensor harness connector

M146 (B) terminal 2 and front air control harness connector M50

(A) terminal 11.

4. Check continuity between intake sensor harness connector

M146 (B) terminal 2 and ground.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Repair harness or connector.

Intake Sensor Component Inspection

INFOID:0000000009478353

COMPONENT INSPECTION

Intake Sensor

After disconnecting intake sensor connector, measure resistance between terminals 1 and 2 at sensor har-

ness side, using the table below.

1 - 26

: Continuity should exist.

AWIIA0434ZZ

2 - 11

: Continuity should exist.

2 - Ground

: Continuity should not exist.

AWIIA0435ZZ

Temperature 

°C (°F)

Resistance k

Ω

−15 (5)

209.0

−10 (14)

160.0

−5 (23)

123.0

0 (32)

95.8

5 (41)

74.9

10 (50)

58.9

15 (59)

46.7

20 (68)

37.3

25 (77)

30.0

30 (86)

24.2

35 (95)

19.7

INTAKE SENSOR

HAC-127

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

If NG, replace intake sensor. Refer to 

VTL-10, "Removal and Installation"

.

40 (104)

16.1

45 (113)

13.2

Temperature 

°C (°F)

Resistance k

Ω

HAC-128

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

Component Description

INFOID:0000000009478354

COMPONENT DESCRIPTION

Front Air Control

The front air control has a built-in microcomputer which processes

information sent from various sensors needed for air conditioner

operation. The air mix door motor, mode door motor, intake door

motor, blower motor and compressor are then controlled.

The front air control is unitized with control mechanisms. When the

various switches and temperature dials are operated, data is input to

the front air control. 

Potentio Temperature Control (PTC)

The PTC is built into the front air control. It can be set from cold to

hot or any intermediate position by rotating the temperature dial.

Front Air Control Component Function Check

INFOID:0000000009478355

SYMPTOM: A/C system does not come on. 

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK

1. Turn blower motor ON, then press A/C switch.

2. Confirm that the compressor clutch engages (sound or visual inspection). 
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-128, "Front Air Control Power and Ground Diagnosis

Procedure"

.

Front Air Control Power and Ground Diagnosis Procedure

INFOID:0000000009478356

Regarding Wiring Diagram information, refer to 

HAC-133, "Wiring Diagram - With Type 1"

.

DIAGNOSTIC PROCEDURE FOR A/C SYSTEM

AWIIA1217ZZ

AWIIA0481ZZ

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

HAC-129

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

SYMPTOM: A/C system does not come on. 

1.

CHECK POWER SUPPLY CIRCUITS FOR FRONT AIR CONTROL

1. Turn ignition switch OFF.

2. Disconnect front air control connector.

3. Turn ignition switch ON.

4. Check voltage between front air control harness connector M59 terminal 27 and M50 terminal 15, and

ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Check 10A fuses [Nos. 8 and 19, located in the fuse block (J/B)]. Refer to 

PG-79, "Terminal

Arrangement"

.

• If fuses are OK, check harness for open circuit. Repair or replace as necessary.

• If fuses are NG, replace fuse and check harness for short circuit. Repair or replace as neces-

sary.

2.

CHECK GROUND CIRCUIT FOR FRONT AIR CONTROL

1. Turn ignition switch OFF.

2. Check continuity between front air control harness connector M59 terminal 35 and ground.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Repair harness or connector.

AWIIA1786GB

Terminals

Ignition switch position

(+)

(-)

OFF

ACC

ON

Front air 

control 

connector

Terminal No.

M50

15

Ground

Approx. 0V

Approx. 0V

Battery 
voltage

M59

27 

Battery 
voltage

Battery 
voltage

Battery 
voltage

35 - Ground

: Continuity should exist.